memorybankee.java

这是一个以JAVA编写的程序,本人还没有试过,是一个简单的温度控制系统

    * methods with an 'extraInfo' parameter can be used:
    * {@link #readPage(int,boolean,byte[],int,byte[]) readPage},
    * {@link #readPageCRC(int,boolean,byte[],int,byte[]) readPageCRC}, and
    * {@link #readPagePacket(int,boolean,byte[],int,byte[]) readPagePacket}.
    *
    * @return  <CODE> true </CODE> if reading the this memory bank's 
    *                 pages provides extra information
    *
    * @see #readPage(int,boolean,byte[],int,byte[]) readPage(extra)
    * @see #readPageCRC(int,boolean,byte[],int,byte[]) readPageCRC(extra)
    * @see #readPagePacket(int,boolean,byte[],int,byte[]) readPagePacket(extra)
    * @since 1-Wire API 0.01
    */
   public boolean hasExtraInfo ()
   {
      return false;
   }

   /**
    * Query to get the length in bytes of extra information that
    * is read when read a page in the current memory bank.  See
    * 'hasExtraInfo()'.
    *
    * @return  number of bytes in Extra Information read when reading
    *          pages in the current memory bank.
    */
   public int getExtraInfoLength ()
   {
      return 0;
   }

   /**
    * Query to get a string description of what is contained in
    * the Extra Informationed return when reading pages in the current
    * memory bank.  See 'hasExtraInfo()'.
    *
    * @return string describing extra information.
    */
   public String getExtraInfoDescription ()
   {
      return null;
   }

   //--------
   //-------- MemoryBank I/O methods
   //--------

   /**
    * Read  memory in the current bank with no CRC checking (device or
    * data). The resulting data from this API may or may not be what is on
    * the 1-Wire device.  It is recommends that the data contain some kind
    * of checking (CRC) like in the readPagePacket() method or have
    * the 1-Wire device provide the CRC as in readPageCRC().  readPageCRC()
    * however is not supported on all memory types, see 'hasPageAutoCRC()'.
    * If neither is an option then this method could be called more
    * then once to at least verify that the same thing is read consistantly.
    *
    * @param  startAddr     starting physical address
    * @param  readContinue  if 'true' then device read is continued without
    *                       re-selecting.  This can only be used if the new
    *                       read() continious where the last one led off
    *                       and it is inside a 'beginExclusive/endExclusive'
    *                       block.
    * @param  readBuf       byte array to place read data into
    * @param  offset        offset into readBuf to place data
    * @param  len           length in bytes to read
    *
    * @throws OneWireIOException
    * @throws OneWireException
    */
   public void read (int startAddr, boolean readContinue, byte[] readBuf,
                     int offset, int len)
      throws OneWireIOException, OneWireException
   {
      int    i, cnt = 0;
      byte[] raw_buf = new byte [2];

      // attempt to put device at max desired speed
      if (!readContinue)
         checkSpeed();

      // check if read exceeds memory
      if ((startAddr + len) > PAGE_LENGTH)
         throw new OneWireException("Read exceeds memory bank end");

      // loop until get a non-0xFF value, or max 6 reads  
      do
      {

         // select the device
         if (!ib.adapter.select(ib.address))
         {
            forceVerify();

            throw new OneWireIOException("Device select failed");
         }

         // build start reading memory block
         raw_buf [0] = READ_MEMORY_COMMAND;
         raw_buf [1] = ( byte ) (startAddr & 0xFF);

         // do the first block for command, address
         ib.adapter.dataBlock(raw_buf, 0, 2);

         // pre-fill readBuf with 0xFF 
         System.arraycopy(ffBlock, 0, readBuf, offset, len);

         // send the block
         ib.adapter.dataBlock(readBuf, offset, len);

         // see if result is non-0xFF
         for (i = 0; i < len; i++)
            if (readBuf [offset + i] != ( byte ) (0xFF))
               return;

         try
         {
            Thread.sleep(10);
         }
         catch (InterruptedException e){}
         ;

         if (!ib.isPresent())
         {
            forceVerify();

            throw new OneWireIOException("Device not present on 1-Wire");
         }
      }
      while (++cnt < 6);

      // still present, assume data really is 0xFF's
   }

   /**
    * Write  memory in the current bank.  It is recommended that
    * when writing  data that some structure in the data is created
    * to provide error free reading back with read().  Or the
    * method 'writePagePacket()' could be used which automatically
    * wraps the data in a length and CRC.
    *
    * When using on Write-Once devices care must be taken to write into
    * into empty space.  If write() is used to write over an unlocked
    * page on a Write-Once device it will fail.  If write verification
    * is turned off with the method 'setWriteVerification(false)' then
    * the result will be an 'AND' of the existing data and the new data.
    *
    * @param  startAddr     starting address
    * @param  writeBuf      byte array containing data to write
    * @param  offset        offset into writeBuf to get data
    * @param  len           length in bytes to write
    *
    * @throws OneWireIOException
    * @throws OneWireException
    */
   public void write (int startAddr, byte[] writeBuf, int offset, int len)
      throws OneWireIOException, OneWireException
   {
      int i;

      // return if nothing to do
      if (len == 0)
         return;

      // check if power delivery is available
      if (!ib.adapter.canDeliverPower())
         throw new OneWireException(
            "Power delivery required but not available");

      // attempt to put device at max desired speed
      checkSpeed();

      // check if write exceeds memory
      if ((startAddr + len) > PAGE_LENGTH)
         throw new OneWireException("Write exceeds memory bank end");

      // write the page of data to scratchpad
      writeScratchpad(startAddr, writeBuf, offset, len);

      // read to verify ok
      byte[] raw_buf = new byte [PAGE_LENGTH];

      readScratchpad(raw_buf, startAddr, 0, PAGE_LENGTH);

      // check to see if the same
      for (i = 0; i < len; i++)
         if (raw_buf [i] != writeBuf [i + offset])
         {
            forceVerify();

            throw new OneWireIOException(
               "Read back scratchpad verify had incorrect data");
         }

      // do the copy
      copyScratchpad();

      // check on write verification
      if (writeVerification)
      {

         // read back to verify
         read(startAddr, false, raw_buf, 0, len);

         for (i = 0; i < len; i++)
            if (raw_buf [i] != writeBuf [i + offset])
            {
               forceVerify();

               throw new OneWireIOException(
                  "Read back verify had incorrect data");
            }
      }
   }

   //--------
   //-------- PagedMemoryBank I/O methods
   //--------

   /**
    * Read  page in the current bank with no
    * CRC checking (device or data). The resulting data from this API
    * may or may not be what is on the 1-Wire device.  It is recommends
    * that the data contain some kind of checking (CRC) like in the
    * readPagePacket() method or have the 1-Wire device provide the
    * CRC as in readPageCRC().  readPageCRC() however is not
    * supported on all memory types, see 'hasPageAutoCRC()'.
    * If neither is an option then this method could be called more
    * then once to at least verify that the same thing is read consistantly.
    *
    * @param  page          page number to read packet from
    * @param  readContinue  if 'true' then device read is continued without
    *                       re-selecting.  This can only be used if the new
    *                       readPage() continious where the last one
    *                       led off and it is inside a
    *                       'beginExclusive/endExclusive' block.
    * @param  readBuf       byte array to place read data into
    * @param  offset        offset into readBuf to place data
    *
    * @throws OneWireIOException
    * @throws OneWireException
    */
   public void readPage (int page, boolean readContinue, byte[] readBuf,
                         int offset)
      throws OneWireIOException, OneWireException
   {

      // check if read exceeds memory
      if (page != 0)
         throw new OneWireException("Page read exceeds memory bank end");

      read(0, readContinue, readBuf, offset, PAGE_LENGTH);
   }

   /**
    * Read  page with extra information in the current bank with no
    * CRC checking (device or data). The resulting data from this API
    * may or may not be what is on the 1-Wire device.  It is recommends
    * that the data contain some kind of checking (CRC) like in the
    * readPagePacket() method or have the 1-Wire device provide the
    * CRC as in readPageCRC().  readPageCRC() however is not
    * supported on all memory types, see 'hasPageAutoCRC()'.
    * If neither is an option then this method could be called more
    * then once to at least verify that the same thing is read consistantly.
    * See the method 'hasExtraInfo()' for a description of the optional
    * extra information some devices have.
    *
    * @param  page          page number to read packet from
    * @param  readContinue  if 'true' then device read is continued without
    *                       re-selecting.  This can only be used if the new
    *                       readPage() continious where the last one
    *                       led off and it is inside a
    *                       'beginExclusive/endExclusive' block.
    * @param  readBuf       byte array to place read data into
    * @param  offset        offset into readBuf to place data
    * @param  extraInfo     byte array to put extra info read into
    *
    * @throws OneWireIOException
    * @throws OneWireException
    */
   public void readPage (int page, boolean readContinue, byte[] readBuf,
                         int offset, byte[] extraInfo)
      throws OneWireIOException, OneWireException
   {

      // only needs to be implemented if supported by hardware
      throw new OneWireException(
         "Read page with extra-info not supported by this memory bank");
   }

   /**
    * Read a Universal Data Packet.
    *
    * The Universal Data Packet always starts on page boundaries but
    * can end anywhere in the page.  The structure specifies the length of
    * data bytes not including the length byte and the CRC16 bytes.
    * There is one length byte. The CRC16 is first initialized to
    * the page number.  This provides a check to verify the page that
    * was intended is being read.  The CRC16 is then calculated over
    * the length and data bytes.  The CRC16 is then inverted and stored
    * low byte first followed by the high byte.  This is structure is
    * used by this method to verify the data but is not returned, only
    * the data payload is returned.
    *
    * @param  page          page number to read packet from
    * @param  readContinue  if 'true' then device read is continued without
    *                       re-selecting.  This can only be used if the new
    *                       readPagePacket() continious where the last one
    *                       stopped and it is inside a
    *                       'beginExclusive/endExclusive' block.
    * @param  readBuf       byte array to put data read. Must have at least
    *                       'getMaxPacketDataLength()' elements.
    * @param  offset        offset into readBuf to place data
    *
    * @return  number of data bytes read from the device and written to
    *          readBuf at the offset.
    *
    * @throws OneWireIOException
    * @throws OneWireException
    */
   public int readPagePacket (int page, boolean readContinue, byte[] readBuf,
                              int offset)
      throws OneWireIOException, OneWireException
   {
      byte[] raw_buf = new byte [PAGE_LENGTH];

      // attempt to put device at speed